WO2010101343A1

WO2010101343A1 - Led lighting device for a greenhouse capable of promoting plant growth

Info

Publication number: WO2010101343A1
Application number: PCT/KR2009/005837
Authority: WO
Inventors: 김규한
Original assignee: 주식회사 포지티브
Priority date: 2009-03-02
Filing date: 2009-10-12
Publication date: 2010-09-10
Also published as: KR100906226B1

Abstract

The present invention relates to lighting used in a greenhouse for promoting plant growth. More specifically, disclosed is a lighting device using an LED which radiates light with a useful wavelength for promoting the plant growth. The present invention provides an LED lighting device for a greenhouse, which comprises: a light source board on which a blue LED with a main wavelength of 420-470 nm and a red LED with a main wavelength of 640-690 nm are randomly arranged; a heat radiation and light concentration plate which is combined with the rear of the light source board and has a shape capable of concentrating the light radiated from the light source board; and a power module which is combined with the heat radiation and light concentration plate and supplies power to the light source board.

Description

LED lighting device for greenhouses to promote plant growth

The present invention relates to lighting used in a greenhouse for promoting plant growth, and more particularly, to an illumination device using an LED that emits light of a wavelength useful for promoting plant growth.

Planting requires a number of elements and nutrients, one of which is light.

Plant leaves contain chloroplasts, which produce the nutrients needed for plant growth, which produces sugar through photosynthesis.

Photosynthesis requires water, carbon dioxide, and light. Water absorbed from the roots is divided into hydrogen and oxygen, which is used directly for photosynthesis and oxygen is released through the pores.

The chloroplast is a double-layered structure surrounded by at least two layers of membranes. Inside, the shelves are stacked in several layers to form a column supporting the shelves, which is called Grana, which corresponds to the organ part of the photosynthetic plant. .

Inside Grana, there is a green pigment called chlorophyll, which is responsible for receiving light, a photosynthetic energy source.

The reason why the plant looks green is because the chlorophyll is in the grana of the leaf cells.

In addition to two types of a and b, there are about 10 different chlorophylls, including c, d, and e. For example, chlorophyll c is in brown algae, chlorophyll d in red algae, and e in inequality. However, since any plant must contain a and b, the most important of the 10 or more types of chlorophyll are considered a and b.

Chlorophylls a and b absorb light most strongly in the red and blue bands of the light spectrum and very weakly in the green bands.

More precisely, chlorophyll a is known to best absorb light at 675 nm wavelength and chlorophyll b is best absorbed at 450 nm wavelength.

Efforts to apply light emitting diodes to lighting began in the late 1990s. In 2006, the global market for phosphors for lighting reached about $ 2 billion, and the LED lighting market is expected to grow by more than 20% annually, and the global market for 2012 is expected to grow to over $ 10 billion. Compared with the existing lighting fixtures, the light emitting diode has a long lifespan with high reliability, low maintenance costs, and low power consumption, which greatly contributes to energy saving. In addition, the design's low fluidity and heat generation make it suitable for use as lighting.

As a result of the technology of green and blue light emitting diodes, which are the first GaN-based light emitting diodes, all three primary colors of light, red, green and blue, can be obtained from light emitting diodes. Next, with continuous technology development, we produced white light emitting diodes using YAG-based phosphors for blue light emitting diodes, and technology development using red, green, and blue phosphors for ultraviolet light emitting diodes is in progress.

An object of the present invention is to provide a greenhouse LED lighting device using the LED as a light source having a wavelength mainly absorbed by chlorophyll well when the power consumption is low.

Another object of the present invention is to provide a greenhouse LED lighting device having a heat dissipation collecting plate that simultaneously emits heat generated from the LED and condenses the light emitted from the LED.

Still another object of the present invention is to provide a greenhouse LED lighting device that emits far-infrared rays to help plant growth by forming a far-infrared radiation coating layer on the heat dissipating light collecting plate.

The present invention provides a light source substrate comprising: a blue LED having a main wavelength of 420 to 470 nm and a red LED having a main wavelength of 640 to 690 nm; A heat dissipation collecting plate coupled to a rear surface of the light source substrate and having a shape capable of collecting light emitted from the light source substrate; And a power module coupled to the heat dissipation panel and supplying power to the light source substrate.

The present invention provides a light source substrate comprising a blue LED having a main wavelength of 420 to 470 nm and a red LED having a main wavelength of 640 to 690 nm. A heat dissipation collecting plate coupled to a rear surface of the light source substrate and having a shape capable of collecting light emitted from the light source substrate; And a power module coupled to the heat dissipation panel to supply power to the light source substrate.

The surface of the heat dissipation panel is 100 parts by weight of an acrylic polyol resin, 10 to 15 parts by weight of polyisocyanate, 120 to 130 parts by weight of methyl ethyl ketone, 120 to 130 parts by weight of butyl acetate, 3 to 5 parts by weight of sapphire powder, and elvan powder 10 It provides a LED lighting apparatus for a greenhouse, characterized in that the far-infrared radiation coating layer is formed of 20 parts by weight, 3 to 5 parts by weight of amethyst powder, 5 to 9 parts by weight of gemstone powder, and 12 to 20 parts by weight of silver powder.

As described above, the LED lighting device for a greenhouse according to the present invention has an effect of reducing energy by using power as an LED as a light source.

In addition, the present invention is provided with a heat-dissipating light collecting plate that emits heat generated from the LED, and simultaneously performs a function of condensing the light emitted from the LED, and forms a far-infrared radiation coating layer on the heat-dissipating light collecting plate to provide far-infrared rays which help plant growth. The effect is to provide a greenhouse LED lighting device that emits.

1 is an exploded perspective view showing the structure of the LED lighting device for greenhouses to promote plant growth according to an embodiment of the present invention.

Figure 2 is a cross-sectional view showing a combined state of the LED lighting apparatus for greenhouses to promote plant growth according to an embodiment of the present invention.

3 is a plan view showing the LED arrangement of the light source substrate according to an embodiment of the present invention.

4 is a plan view showing the LED arrangement of the light source substrate according to another embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of a greenhouse LED lighting device for promoting plant growth according to the present invention.

In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or custom.

Therefore, definitions of these terms should be made based on the contents throughout the specification.

1 is an exploded perspective view showing a structure of a greenhouse LED lighting apparatus for promoting plant growth according to an embodiment of the present invention, Figure 2 is a combination of a greenhouse LED lighting apparatus for promoting plant growth according to an embodiment of the present invention It is sectional drawing which showed state.

As shown, the LED lighting device according to the present invention absorbs heat generated from the light source substrate 130 by coupling to the light source substrate 130 and the rear surface of the light source substrate 130 is arranged a plurality of LED, LED And a heat dissipation collecting plate 120 for condensing the light generated by the light source, and a power module 110 for supplying power to the light source substrate 130.

The plurality of LEDs arranged on the light source substrate 130 includes a blue LED 134 emitting a main wavelength in the range of 420 to 470 nm, which is a wavelength region in which chlorophyll b absorbs well, and a 640 to 690 nm wavelength region in which chlorophyll a absorbs well. It consists of a red LED 132 emitting a dominant wavelength in the range.

The plurality of blue LEDs 134 and the plurality of red LEDs 132 are mixed and disposed on the light source substrate 130, and the light source substrate 130 may be disposed to be offset from each other so that light may be uniformly dispersed.

The heat dissipation panel 120 simultaneously performs a heat dissipation function of absorbing and emitting heat generated from the

LEDs

132 and 134 of the light source substrate 130 and a light condensing function of reflecting and condensing light emitted from the

LEDs

132 and 134. .

In order to perform an excellent heat dissipation function, the heat dissipation collecting plate is preferably made of aluminum or an aluminum alloy having high thermal conductivity.

In order to perform the light condensing function, the heat dissipating light collecting plate 120 may have a shape such as a parabola, a hemispherical shape, and an oval shape.

In addition, the heat dissipation panel 120 forms a far-infrared radiation coating layer on the surface, thereby dissipating heat and supplying far-infrared rays to the plant to promote growth.

Detailed description of the far-infrared radiation coating layer will be described later.

The heat collecting plate 120 is mechanically coupled to the light source board 130 and the power module 110.

Electrically, the power module 110 and the light source substrate 130 should be connected. For this purpose, the power module 110 includes a power supply line 112 and a connector 115, and the connector 115 has a light source substrate. Is coupled to the back of 130. To this end, the heat dissipation panel 120 has a through hole 122 that can pass through the connector 115.

The power module 110 performs a function of converting a typical AC power source into a DC power source suitable for driving an LED.

3 is a plan view showing the LED arrangement of the light source substrate according to an embodiment of the present invention, Figure 4 is a plan view showing the LED arrangement of the light source substrate according to another embodiment of the present invention.

In the light source substrate 130a of FIG. 3, the red LEDs 132 and the blue LEDs 134 are arranged to alternate with each other in a checkerboard shape. As shown, different types of LEDs are arranged on the side and top and bottom, and the same type of LEDs are arranged in the diagonal direction.

By having such an arrangement, a wavelength in the range of 420 to 470 nm and a wavelength in the range of 640 to 690 nm can be supplied uniformly throughout.

In the light source substrate 130b of FIG. 4, the red LED 132 and the blue LED 134 are arranged in a concentric shape. One concentric circle is formed of the same type of LED, and the outside and the inside thereof are formed of different kinds of LEDs.

As in the embodiment of Figure 3, the overall wavelength and the wavelength range of 420 ~ 470nm and 640 ~ 690nm range for the entire uniform supply.

Hereinafter, the far-infrared radiation coating layer formed on the reflecting surface of this invention is demonstrated in detail.

The far-infrared radiation coating layer comprises 10 to 15 parts by weight of polyisocyanate, 120 to 130 parts by weight of methyl ethyl ketone, 120 to 130 parts by weight of butyl acetate, and 3 to 5 parts of acrylic polyol resin (trade name Aekyung Chemical A-814). It includes a weight part, 10 to 20 parts by weight of elvan powder, 3 to 5 parts by weight of amethyst powder, 5 to 9 parts by weight of gemstone powder, and 12 to 20 parts by weight of silver powder.

Each powder is preferably pulverized so that the average particle size is in the range of 5 to 10 μm. If the particle size is too small, there is a difficulty in the manufacturing process, if the particle size is too large, there is a problem that the particles are not evenly dispersed.

The composition of 100 g of acrylic polyol resin as a binder resin, 15 g of polyisocyanate as a curing agent, and 120 g of methyl ethyl ketone and butyl acetate as solvents were the same, and the composition of each powder was changed to measure far-infrared emissivity and reflectance.

The thickness of the coating layer was all tested uniformly to 100㎛.

Table 1 shows the coating layer compositions of Examples and Comparative Examples.

Table 1

Examples 1 to 5 are all five powders are included in the composition range,

In Comparative Example 1, the pulsatile powder is added in excess,

Comparative Example 2 is the addition of gankhite powder in excess, without the addition of sapphire powder,

Comparative Example 3 is the addition of a small amount of ganban stone powder, without adding a boulder powder, an excess of silver powder,

Comparative Example 4 is the addition of excess gemstone powder,

In Comparative Example 5, an excess of silver powder was added without adding elvan rock powder.

Table 2 shows the results of measuring the far-infrared emissivity and average luminance of the Examples and Comparative Examples.

TABLE 2

The measurement of far-infrared emissivity was carried out using JIP-E500 and the measurement conditions were 1/16 cm, resolution count was 20 times, MCT was used as a detector, and measurement temperature was performed at 35 degreeC.

The luminance was measured using the same light source substrate. The luminance was measured using a BM-7 luminance meter from Topcon, Japan.

The higher the luminance, the better the light collection. Therefore, the higher the luminance, the better the reflection characteristic of the coating layer.

Looking at the results, the examples are all far-infrared emissivity and brightness while maintaining the appropriate level,

In Comparative Example 1, the pulsatile powder was added in excess, and the far-infrared emissivity was good, but the luminance was low.

Comparative Example 2 is the addition of an excess of elvan rock powder and no sapphire powder, and also has good far-infrared emissivity but low luminance,

In Comparative Example 3, a small amount of ganbanite powder was added, and an excessive amount of silver powder was added without adding the jadeite powder, and the luminance and far-infrared emissivity were both low,

Comparative Example 4 is an excessive addition of gemstone powder, shows a good far-infrared emissivity but low brightness,

In Comparative Example 5, an excess of silver powder was added without adding the elvan powder, and it can be seen that the far-infrared emissivity is low with good luminance.

Table 3 shows the results of measuring the far-infrared emissivity and reflectance of the coating layer of Example 1 with different thicknesses.

TABLE 3

Far-infrared emissivity increased with increasing thickness of the coating layer and then decreased again when it exceeded 110 μm.

The luminance continued to increase with increasing thickness of the coating layer, but the increase tended to decrease while exceeding 120 µm.

Therefore, the thickness of the coating layer in consideration of the luminance and far-infrared emissivity is preferably in the range of 80 ~ 120㎛.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art to which the art belongs can make various modifications and other equivalent embodiments therefrom. Will understand.

Therefore, the true technical protection scope of the present invention will be defined by the claims below.

Claims

A light source substrate in which a blue LED having a main wavelength of 420 to 470 nm and a red LED having a main wavelength of 640 to 690 nm are mixed and arranged;

A heat dissipation collecting plate coupled to a rear surface of the light source substrate and having a shape capable of collecting light emitted from the light source substrate; And

And a power supply module coupled to the heat dissipation panel and supplying power to the light source substrate.
The method of claim 1,

The blue LED and the red LED is a greenhouse LED lighting device, characterized in that arranged alternately with each other.
The method of claim 1,

The blue LED and the red LED is a greenhouse LED lighting device, characterized in that overlapping arrangement in the form of concentric circles.
A light source substrate in which a blue LED having a main wavelength of 420 to 470 nm and a red LED having a main wavelength of 640 to 690 nm are mixed and arranged;

A heat dissipation collecting plate coupled to a rear surface of the light source substrate and having a shape capable of collecting light emitted from the light source substrate; And

And a power module coupled to the heat dissipation panel and supplying power to the light source substrate.

The surface of the heat dissipation panel is 100 parts by weight of an acrylic polyol resin, 10 to 15 parts by weight of polyisocyanate, 120 to 130 parts by weight of methyl ethyl ketone, 120 to 130 parts by weight of butyl acetate, 3 to 5 parts by weight of sapphire powder, and elvan powder 10 Greenhouse LED lighting apparatus, characterized in that the far-infrared radiation coating layer is composed of 20 parts by weight, 3 to 5 parts by weight of amethyst powder, 5 to 9 parts by weight of gemstone powder, 12 to 20 parts by weight of silver powder.
The method of claim 4, wherein

The sapphire powder, ganban stone powder, amethyst powder, gemstone powder, silver powder is a greenhouse LED lighting device, characterized in that the average particle size of 5 ~ 10um range.
The method of claim 4, wherein

The coating layer is a greenhouse LED lighting device, characterized in that formed in a thickness of 80 ~ 120um.